Matthew--
 
Try contacting Wayne Smith (WTS@MAINE or [log in to unmask]): he has
developed a program that compiles digests from Listserv mail.  It still
takes some handling after the digest is compiled (e.g., to strip out
unnecessary header material) but we've been using it to digestify PMC-TALK
and it works well.
 
John Unsworth
Co-Editor, _Postmodern Culture_